ARRT MRI PRACTICE, STUDY GUIDE AND FINAL
EXAMS LATEST 2024 ACTUAL EXAMS WITH CORRECT
QUESTIONS AND VERIFIED RATIONALES ANSWERS
ALREADY GRADED A+ GUARANTEED PASS!!!
The effects of main magnetic field inhomogeneities on the FID signal are corrected for in a Spin-echo
sequence by applying a second radio-frequency pulse. The flip angle of this radio-frequency pulse is:
180 degrees
Of the following statements, which describes part of the basic MR imaging process?
Radio-frequency signals interact with hydrogen protons
Which type of electromagnetic coils correct inhomogeneities in the main magnetic field?
Shim coils
Immediately after an initial 90 degree radio-frequency pulse is turned off, the hydrogen protons will
begin to:
Dephase
Tissues that are very efficient at Spin-lattice interactions near the Larmor frequency, such as fatty
tissues, should have:
Low T1 values and produces hyperintense signals
T1 is the measurement of time for the longitudinal component of the net magnetization vector to
recover what percentage of its original value after the application of a 90 degree radio-frequency pulse?
63%
The tissue characteristic which depends more on the state (solid, liquid, gas) of a tissue than any other
factor is:
T2 effects
The basic process of MR signal generation contains two basic steps, they are:
Stimulation and relaxation
The T1 Process is also known as:
Spin-Lattice
,The T2 process is also known as:
Spin-Spin
Once in the main magnetic field, a majority of hydrogen protons will align themselves:
Parallel to B0
Magnetic resonance imaging is derived from the process known as:
Nuclear magnetic resonance
The tissue characteristic that depends heavily on the relative content of fat molecules and free water is:
T1 effects
Which type of receiver radio-frequency coil is placed close to the patient's body for the purpose of
imaging superficial anatomic structures?
Surface coils
An equation derived to predict the MR signal intensity of a particular tissue as a result of a spin-echo
pulse sequence is the:
Larmor equation
Which equation is true of the relaxation process?
Without the effects of T2 star, T2 decay continues
Because of the spinning motion of the hydrogen proton it has the same properties as a bar magnet. The
hydrogen proton's spinning motion gives it a:
Magnetic moment
On a proton density image, two types of tissue that contain very low concentrations of hydrogen appear
very hypointense are: (RESEARCH THIS)
Cortical bone and lung (RESEARCH THIS)
Magnetic susceptibility is defined as: (RESEARCH THIS)
Tendency of a substance to attract or repel magnetic lines of force which is decided by the magnetic
properties of its electrons (RESEARCH THIS)
In comparison to computed axial tomography, an advantage of MR is:
Superior soft-tissue contrast resolution
Fast transition phenomenon and entry phenomenon are theories that explain which of the following
tissue characteristics?
Velocity effects
,In a loop of conductor in which an electric current is introduced and maintained, a magnetic field will be
produced in the center perpendicular to the flow of electric current. This is called:
Faraday's Law
Which type of MRI magnet has attainable field strengths of 0.35 Tesla to 3 Tesla for clinical use in the
U.S.A, and higher strengths elsewhere and in research?
Superconcuctive
The purpose of the first use of metal ions in MRI enhancement, like gadolinium, is to
Decrease relaxation time for H(ydrogen) in tissues
A permanent magnet requires liquids helium and liquid nitrogen on a dedicated cooling system
False
Which type of MRI magnet is made up of naturally ferromagnetic material
Permanent
MRI magnets that must have a dedicated, special cooling system due to heat produced by large currents
( approx. 100-150 amps) are
Resistive
Substances which have magnetic properties of their own, such as methemoglobin or gadolinium, cause
shortened T1 and T2 values for tissues in their vicinity are
Paramagnetic
Information acquired when you increase or decrease the frequency of the RF pulse of the Gs, .....
To be continued.......
In MRI substances respond to a specific radio frequency which is known as
Resonance frequency
Effects associated with gradient magnetic fields in MR systems are
A)Tissue hearing and cataract formation
Possible effects of exposure to the transient radio frequency signals are
B) tissue hearing and cataract composition
Possible effects of exposure to the main magnetic field are
D) magnetophosphenes, bones healing faster, cardiac fibrillation
Relaxation from Resonance Begins set the time
C) B sub 1 isturned off
, In 1990 Lauffer described two types of contrast media, the mechanism of the T1 agent is to
D) decrease T1 relaxation time, this emitting high signal.
For the following spin echo protocol: fov 320/TR 500/ TE 25/ slice thickness 5mm/ slice gap 1 mm/ NEX
4/ matrix 192. Increasing the Field of View will
Increase SNR
What factor, in spatial localization, does the slope of the slice select gradient?
Slice thickness
What is the gyro-magnetic ratio of hydrogen
42.58MHz
For the followong spin echo protocol.
FOV 320/ TR 500/ TE 25/ slice thickness 5mm/ slice gap 1mm/ NEX 4/ matrix 192. Decreasing slice
thickness will
Decrease SNR
The Process of relaxation begins when
B1 is turned off
A sinewave is a symbol used to measure electromagnetic energy. A sinewave's two components of
measure are:
Wavelength and frequency
Magnetic fields have direction which are usually designated as north and south, therefore magnetic
fields are described as:
Dipoles
At any one time, human body tissue, in general, is made up of 50-90%:
H(Hydrogen)
Once the net magnetization vector (NMV) has moved away from equilibrium the following will occur:
The transverse component will increase
The T1 process is also known as:
Spin-Lattice
Which of the following is the Larmor equation?
W0=Y+B0
The mechanism of T2 contrast enhancement agents is to:
EXAMS LATEST 2024 ACTUAL EXAMS WITH CORRECT
QUESTIONS AND VERIFIED RATIONALES ANSWERS
ALREADY GRADED A+ GUARANTEED PASS!!!
The effects of main magnetic field inhomogeneities on the FID signal are corrected for in a Spin-echo
sequence by applying a second radio-frequency pulse. The flip angle of this radio-frequency pulse is:
180 degrees
Of the following statements, which describes part of the basic MR imaging process?
Radio-frequency signals interact with hydrogen protons
Which type of electromagnetic coils correct inhomogeneities in the main magnetic field?
Shim coils
Immediately after an initial 90 degree radio-frequency pulse is turned off, the hydrogen protons will
begin to:
Dephase
Tissues that are very efficient at Spin-lattice interactions near the Larmor frequency, such as fatty
tissues, should have:
Low T1 values and produces hyperintense signals
T1 is the measurement of time for the longitudinal component of the net magnetization vector to
recover what percentage of its original value after the application of a 90 degree radio-frequency pulse?
63%
The tissue characteristic which depends more on the state (solid, liquid, gas) of a tissue than any other
factor is:
T2 effects
The basic process of MR signal generation contains two basic steps, they are:
Stimulation and relaxation
The T1 Process is also known as:
Spin-Lattice
,The T2 process is also known as:
Spin-Spin
Once in the main magnetic field, a majority of hydrogen protons will align themselves:
Parallel to B0
Magnetic resonance imaging is derived from the process known as:
Nuclear magnetic resonance
The tissue characteristic that depends heavily on the relative content of fat molecules and free water is:
T1 effects
Which type of receiver radio-frequency coil is placed close to the patient's body for the purpose of
imaging superficial anatomic structures?
Surface coils
An equation derived to predict the MR signal intensity of a particular tissue as a result of a spin-echo
pulse sequence is the:
Larmor equation
Which equation is true of the relaxation process?
Without the effects of T2 star, T2 decay continues
Because of the spinning motion of the hydrogen proton it has the same properties as a bar magnet. The
hydrogen proton's spinning motion gives it a:
Magnetic moment
On a proton density image, two types of tissue that contain very low concentrations of hydrogen appear
very hypointense are: (RESEARCH THIS)
Cortical bone and lung (RESEARCH THIS)
Magnetic susceptibility is defined as: (RESEARCH THIS)
Tendency of a substance to attract or repel magnetic lines of force which is decided by the magnetic
properties of its electrons (RESEARCH THIS)
In comparison to computed axial tomography, an advantage of MR is:
Superior soft-tissue contrast resolution
Fast transition phenomenon and entry phenomenon are theories that explain which of the following
tissue characteristics?
Velocity effects
,In a loop of conductor in which an electric current is introduced and maintained, a magnetic field will be
produced in the center perpendicular to the flow of electric current. This is called:
Faraday's Law
Which type of MRI magnet has attainable field strengths of 0.35 Tesla to 3 Tesla for clinical use in the
U.S.A, and higher strengths elsewhere and in research?
Superconcuctive
The purpose of the first use of metal ions in MRI enhancement, like gadolinium, is to
Decrease relaxation time for H(ydrogen) in tissues
A permanent magnet requires liquids helium and liquid nitrogen on a dedicated cooling system
False
Which type of MRI magnet is made up of naturally ferromagnetic material
Permanent
MRI magnets that must have a dedicated, special cooling system due to heat produced by large currents
( approx. 100-150 amps) are
Resistive
Substances which have magnetic properties of their own, such as methemoglobin or gadolinium, cause
shortened T1 and T2 values for tissues in their vicinity are
Paramagnetic
Information acquired when you increase or decrease the frequency of the RF pulse of the Gs, .....
To be continued.......
In MRI substances respond to a specific radio frequency which is known as
Resonance frequency
Effects associated with gradient magnetic fields in MR systems are
A)Tissue hearing and cataract formation
Possible effects of exposure to the transient radio frequency signals are
B) tissue hearing and cataract composition
Possible effects of exposure to the main magnetic field are
D) magnetophosphenes, bones healing faster, cardiac fibrillation
Relaxation from Resonance Begins set the time
C) B sub 1 isturned off
, In 1990 Lauffer described two types of contrast media, the mechanism of the T1 agent is to
D) decrease T1 relaxation time, this emitting high signal.
For the following spin echo protocol: fov 320/TR 500/ TE 25/ slice thickness 5mm/ slice gap 1 mm/ NEX
4/ matrix 192. Increasing the Field of View will
Increase SNR
What factor, in spatial localization, does the slope of the slice select gradient?
Slice thickness
What is the gyro-magnetic ratio of hydrogen
42.58MHz
For the followong spin echo protocol.
FOV 320/ TR 500/ TE 25/ slice thickness 5mm/ slice gap 1mm/ NEX 4/ matrix 192. Decreasing slice
thickness will
Decrease SNR
The Process of relaxation begins when
B1 is turned off
A sinewave is a symbol used to measure electromagnetic energy. A sinewave's two components of
measure are:
Wavelength and frequency
Magnetic fields have direction which are usually designated as north and south, therefore magnetic
fields are described as:
Dipoles
At any one time, human body tissue, in general, is made up of 50-90%:
H(Hydrogen)
Once the net magnetization vector (NMV) has moved away from equilibrium the following will occur:
The transverse component will increase
The T1 process is also known as:
Spin-Lattice
Which of the following is the Larmor equation?
W0=Y+B0
The mechanism of T2 contrast enhancement agents is to:
